Shelving unit



FIG. 1 is a front, top, side perspective view of a shelving unit showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof, the left side view being a mirror image;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines in the drawings illustrate environmental material that form no part of the claimed design. 

CLAIM The ornamental design for a shelving unit, as shown and described. 